5W40 is what you want for your S3, especially when remapped but there are different types of oils (thinner/thicker) within each viscosity so you want to make sure that it is the correct type you're using (needs to be 504.00/507.00 spec). Can you find out more specifics about the Nissan oil? Ester oils are the best out there of which a couple of examples are Millers Nanodrive CFS and Motul 300V.
My mate at nissan is unsure of the grade and to be honest, although its going to be free, i dont want to skimp on oil. So am looking at nanodrive oil as above.
So am probably looking at getting stage2+ either end of may or end of june... i always tend to do oil change before this... if i did it this week coming will that be fine... or wait till closer to map day to be more fresh?
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